... casting ones. (4)Apparent design: In the same step with international fashion-style. (5)Service life:The same as imported butterfly ... :(1)Material Contact Parts:304 or 316L; (2)sealing material:standard EPDM, SILICON,FDM,HNBR for option Joint style:(1)weld ... or equipment are made to DIN 11850,IDF/ISO,SMS,international standard size.